When I do bring prescription drugs and creams, I love professional samples. It helps that I live with an MD, but when you or a loved one goes to the GP, Dermatologist, etc, they can ask, "my husband/wife/father is a backpacker and would really appreciate the smallest tube of anti-fungal / cortisone / antibiotic / cream you could recommend". The samples are (1) free to them, (2) free to you (they aren't pharmacists, they can't sell it) (3) always the newest stuff (still on patent with a high mark-up), (4) labelled, unlike some plastic straw you've heat-welded shut, and (5) really tiny - 1 to 2 grams of cream.
Even if you're not sleeping with a physician (and before I was), I found I could present a reasonable, small-quanity list to an provider (like from the appendix in "Medicine for Mountaineers" - xerox it, reduce the quantities, and legible cross off the narcotics) and get scripts to take to the drug store. Crossing off the narcotics will immediately elevate you in their mind to someone reasonable, because - good grief! - half the calls that wake me and my wife from bed are some addict claiming, "the dog ate my Oxycontin". Instead, tell them you think for reasons of safety, theft, and international borders, you don't want narcotics but ask them to advise you on the safe upper limits of over-the-counter NSAIDs.
>" I've also learned to pack a couple tampons"
30 years ago, I was driving with three lesbian friends into Boston for a Lily Tomlin show. On MassPike with no stores around, one says, "Ooh!, Does anyone have a tampon?" and another says, "Ahhhhh, no, but I think I need one, too." And I open my glovebox and take out half a dozen. It takes a few minutes for anyone to comment how weird it was that only the guy was prepared, but I pointed out that the emotional angst of 28 days prior made it REALLY easy for me to remember.
Which reminds me: a condom. It makes a handy one-fingered glove to remove an impacted stool. It also is excellent for preventing the original, sexually-transmitted disease - pregnancy (for those trips you might be making with straight women).